320401520 has 20 divisors (see below), whose sum is σ = 744933720. Its totient is φ = 128160576.

The previous prime is 320401519. The next prime is 320401577. The reversal of 320401520 is 25104023.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2002430 + ... + 2002589.

It is an arithmetic number, because the mean of its divisors is an integer number (37246686).

Almost surely, 2^320401520 is an apocalyptic number.

It is an amenable number.

320401520 is an abundant number, since it is smaller than the sum of its proper divisors (424532200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320401520 is a wasteful number, since it uses less digits than its factorization.

320401520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4005032 (or 4005026 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 320401520 is about 17899.7631269243. The cubic root of 320401520 is about 684.2763380774.

Adding to 320401520 its reverse (25104023), we get a palindrome (345505543).

The spelling of 320401520 in words is "three hundred twenty million, four hundred one thousand, five hundred twenty".